how do i approximate pi using queation of arctan(1)=4*arctan(1/5)-arctan(1/239) ?

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BINNAN YU 2017-9-9

编辑： Walter Roberson 2017-9-9

here is my thought:

step 1: use build in function taylor to expand arctan(x) to 10th truncation order.

step 2: create a function using the expansion outcome from step 1, and then plug into 1/5 and 1/239? I have not idea about it. Help!

Jose Marques 2017-9-9

This may be helpfull:

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how do i approximate pi using queation of arctan(1)=​4*arctan(1​/5)-arctan​(1/239) ?